Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5853f45b8a1cc2…

MALICIOUS

PDF

47.6 KB Created: 2021-05-13 18:38:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1478734c120581da8bd62b96cc13809e SHA-1: c87ce2f977284de58d3c3b1c61d049958f47504d SHA-256: ef5853f45b8a1cc2d58783599438f570b767621a6b8da11a48e04a5e0330af31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a game hack generator, which redirects to known malicious infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/roblox-password-hacker-game-hack In PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/earn-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.yantan.com.tw/upload/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D36 27988 bytes
SHA-256: 8530f8453faa67fdd5d54ce2b1b65c96f1f937a22fd05d1d7aeaa224e7c47680
font_01_sfnt_off00008cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000967d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967D 18672 bytes
SHA-256: 2bdb07dac700063222d9705cc7006270fda87721bb9ffc7ab205fe7d4072a16f